WAS v8.5 > Develop applications > XML applications > Use the XML API to perform operations > Use external variables and functions

Use external variables

The XML API allows you to access external variables from XPath and XQuery expressions as well a stylesheet parameters from XSLT stylesheets. External variables are useful when the XML processing depends on information not contained in an input document. If you are writing an application that allows users to search for books by title in a library stored as XML, for example, you could prepare a single XQuery expression to find books in the library that uses a variable for the book title to be matched. The resulting XQueryExecutable object can be used for each search the user submits by binding the submitted book title to the variable. The details of using external variables and stylesheet parameters are presented in separate articles for XPath, XQuery, and XSLT.

• Use external variables with XPath.
• Use external variables with XQuery.
• Set parameters with XSLT.

Subtopics

• Use external variables with XPath
  When using an XPath expression that uses external variables, supply (or bind) values for each variable using an XDynamicContext instance and optionally declare the types of the variables using an XStaticContext instance.
• Use external variables with XQuery
  When using an XQuery expression that uses external variables, supply (or bind) values for each variable using an XDynamicContext instance and optionally declare the types of the variables using an XStaticContext instance.
• Set parameters with XSLT
  To use parameters in an XSLT stylesheet, declare the parameters as global parameters in the stylesheet itself.

Related

Use external variables with XPath
Use external variables with XQuery
Set parameters with XSLT

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